Tesoro Refinery

We regulate water, hazardous waste, and cleanup activities at the Tesoro Refining & Marketing Company in Anacortes.

Facility information

The refinery began operating in 1955. Owned by Marathon and doing business as Tesoro, it processes crude oil into a variety of petroleum products and has about 330 employees and 280 contractors that work on the site.

  • At full production, the refinery has the ability to process 120,000 barrels of crude oil each day.
  • Wastewater from the petroleum-making process is treated and sent to Fidalgo Bay.

Permit information

  • Wastewater permit
  • Because of the size of the hazardous waste permit, it is only available by request. Contact Teresa Gibson at teresa.gibson@ecy.wa.gov or 360-407-6916.

The Northwest Clean Air Agency regulates the refinery’s air quality activities. Visit the Northwest Clean Air Agency website or call 800-622-4627 for more information.

Tesoro contacts

Company website
Facility phone: 360-428-1617 or 800-622-4627
Location: West March Point Road, Anacortes, Wash.